package com.zh.yida.filter;

import com.alibaba.fastjson.JSON;
import com.zh.yida.common.BaseContext;
import com.zh.yida.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter("/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        1、获取本次请求的URI
        String url = request.getRequestURI();
        log.info("本次请求的为：-------{}", url);
//        2、判断本次请求是否需要处理
        String[] urlArr = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "common/**",
                "/user/sendMsg",
                "/user/login"
        };
//        3、如果不需要处理，则直接放行
        if (check(url, urlArr)) {
            filterChain.doFilter(request, response);
            return;
        }
//        4、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null) {
//        通过ThreadLocal存储id
            Long userId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setThreadLocal(userId);
            filterChain.doFilter(request, response);
            return;
        }

//        4、判断手机端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
//        通过ThreadLocal存储id
            Long userId = (Long)request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(userId);
            filterChain.doFilter(request, response);
            log.info("手机端登陆le");
            return;
        }else {
            log.info("手机端未登陆");
        }
//        5、如果未登录则返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
//        log.info("请求地址为：" + request.getRequestURL());
    }

    /**
     * 判断本次请求是否需要处理
     *
     * @param url
     * @param urlArr
     * @return
     */
    public boolean check(String url, String[] urlArr) {
        for (String s : urlArr) {
            boolean flog = PATH_MATCHER.match(s, url);
            if (flog) {
                log.info("用户登陆了{}", url);
                return true;
            }
        }
        log.info("用户{}未登陆", url);
        return false;
    }
}
